Calipers



Oct. 11, 1927. 1,644,967

G. s. WETTIVQICH CALLPERS Filed Auz. 5, 1925 Patented Oct. 11, 1927.

UNITED STATES GEORGE S. WETTRICH, OF PONTIAC, MICHIGA1\T.

GALIPERS.

Application filed August 5, 1925. Serial No. 48,249. I

ing points for various kinds of work, and to furnish a. caliper of theplier type with an adjustable tension device for holding the jaws of thecaliper closed on a piece of work.

Further objects of my invention are to provide a caliper having opposedhandles with one of the handles constituting a support for an indicatoror gauge, and the other handle serving as an actuating medium for theindicator, and to accomplish this and other results by a strong, durableand inexpensive device.

My invention will be hereinafter specifically described and thenclaimed, and reference will now be had to the drawing, wherein Figure 1is a side elevation of the caliper;

Fig. 2 is a plan of the same, and

Fig. 3 is an end view.

In the drawing, the reference numerals 1 and 2 denote plier shapedhandles having substantially parallel spaced apart hand grip portionsthat may be knurled or otherwise roughened so that a firm hand grip maybe had for manipulating the caliper. One end of the handle 1 has anapertured ear 8 loosely fitting between a set of apertured ears t ofthe-handle 2 and all of said ears are pivotally connected together by arivet or pin 5. The apertured ears 3 and i are formed with arcuated jawmembers 6 and 7 having the outer ends thereof apertured, as at 8 forcountersunk screws 9 employed for holding jaw blocks 10 and 11 inopposing relation on the jaw members 6 and 7 respectively. The jaw block11 provides a. point contact 12 for apiece of work and the jaw block 11has two or more contacts 13 for a piece of work, thus providing a threeor more point contact between the jaw members 6 and 7 for a piece ofwork placed in the caliper. The jaw blocks 10 and 11 are interchangeableand blocks of various sizes and configurations may be used in accordancewith a piece of work to be measured.

The jaw member 7 is provided with a work stop li carried by a slottedplate 15 adjustably secured to one side of the jaw member 7 by a screw1601 other holding means. This work stop may be positioned to correctlydefine the location of a piece of work between the jaw members 6 and 7,so that the jaw blocks 10 and 11 may 'properly engage the piece of work.

Attached to the. inner wall of the handle 2, adjacent the apertured earsat is a tension device in the form of a fiat spring 17 made in two partswith the parts adjustably connected' together by a nut equipped screw18. The parts of the spring may be adjusted to increase or decrease theover-all longitudinal dimension of the tension device and one end of thespring is attached to the handle 2, as at 19, while the opposite end ofthe spring is curved, as at 20, to bear against the handle 1 and holdthe handles 1 and 2 spread apart with the jaw blocks 10 and 11 closed ona piece of work.

The caliper handle 2 has a flat extension 21 provided with a slot 22 andextending through said slot is the L-shaped extension 23 of the caliperhandle 1. By this arrangement the extensions 21 and 23 have theextremities thereof in proximity 'to each other and approximatelyparallel.

On the flat extension 21 is a lug 24; and at tached thereto by a setscrew 25 is a clamping member 26 supporting the stem 27 of a gauge 28,said gauge being preferably an indicator adapted to be actuated by a pin29. The pin extends behind the flat extension 21 into engagement withthe extension 23 and said extension is also engaged by an adjustablestop 30 carried by the fiat extension 21 and adapted to be set and heldby a jam nut 31. The stop 30 constitutes means for preventing anexcessive action of the extension 23 against the indicator pin 29, thusavoiding possible injury to the indicator when not in use. 3

Since interchangeable jaw blocks are used in connection with thecaliper, it may become necessary to adjust the spring 17, the positionof the indicator 28, and the stop 30. All of these adjustments areeasily performed and the caliper can be readily manipulated in one handto ascertain a desired exterior dimension. It is apparent that thecaliper can be manipulated somewhat similar to a pair of pliers and whenplaced in engagement with a piece of work the gauge and of less heightthan the length of the extension 28, there "is clearance above the gaugefor an arm gripping thecalipers. In other Words the gauge is inaconvenient location that Will not interfere with manipulation of thecalipers in the usual manner.

It is thought that the utility of my inven- 7 tion will be apparentWithout further; de-

scription, and While in the'drawing there is illustrated, a preferredembodiment of my caliper, it is to be understood that the structuralelements are susceptible to such variations and modifications as fallWithin the scope of the appended claims.

WVhat I claimis p l. A caliper comprising pivotally connected handles, acomparatively flat twopart spring between said handles'holding saidhandles normallyseparated, said spring having its parts connectedtogether so that said spring may be adjusted in its longitudinaldimension, jaw members carried by said handles, interchangeable jawblocks attached to said jaw members, and a gauge supported from one ofsaid handles and actuated by the other handle. I

2. A caliper having handles With one of said handles having a flatextension, and the other handle an L shaped extension extending throughsaid flat extension so that the extremities of said extensions are inproximity to each other, an adjustable gauge supported from said flatextension and adapted to be actuated by said L extension, andinterchangeable jaw blocks supported from said handles.

3 A caliper comprising handles having substantially parallel spacedapart hand grip portions, jaws carried by said handles adaptedforengagement With a piece of Work, a dial type indicator adjustablysupported from one of said handles and having its dial axissubstantially at a right angle to the hand grip portions of saidhandles, and

7 adapted to be actuated by the other handle,

and means under said indicator and on the enonen s. WETTRIGHQ

